<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>系统维护中</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #333;
        }

        .maintenance-container {
            background: white;
            border-radius: 20px;
            padding: 60px 40px;
            text-align: center;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
            max-width: 500px;
            width: 90%;
            position: relative;
            overflow: hidden;
        }

        .maintenance-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, #667eea, #764ba2);
        }

        .maintenance-icon {
            width: 80px;
            height: 80px;
            margin: 0 auto 30px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .maintenance-icon::before {
            content: '🔧';
            font-size: 36px;
            animation: rotate 3s linear infinite;
        }

        @keyframes rotate {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .maintenance-title {
            font-size: 28px;
            font-weight: 700;
            color: #2d3748;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .maintenance-subtitle {
            font-size: 16px;
            color: #718096;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        .maintenance-message {
            background: #f7fafc;
            border-left: 4px solid #667eea;
            padding: 20px;
            margin: 30px 0;
            border-radius: 0 8px 8px 0;
            text-align: left;
        }

        .maintenance-message h3 {
            color: #2d3748;
            font-size: 16px;
            margin-bottom: 10px;
            font-weight: 600;
        }

        .maintenance-message p {
            color: #4a5568;
            font-size: 14px;
            line-height: 1.5;
            margin-bottom: 8px;
        }

        .contact-info {
            margin-top: 40px;
            padding-top: 30px;
            border-top: 1px solid #e2e8f0;
        }

        .contact-info h4 {
            color: #2d3748;
            font-size: 14px;
            margin-bottom: 15px;
            font-weight: 600;
        }

        .contact-item {
            display: inline-block;
            margin: 0 15px;
            color: #667eea;
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .contact-item:hover {
            color: #764ba2;
        }

        .loading-dots {
            display: inline-flex;
            margin-left: 10px;
        }

        .loading-dots span {
            width: 6px;
            height: 6px;
            background: #667eea;
            border-radius: 50%;
            margin: 0 2px;
            animation: loading 1.4s infinite ease-in-out both;
        }

        .loading-dots span:nth-child(1) { animation-delay: -0.32s; }
        .loading-dots span:nth-child(2) { animation-delay: -0.16s; }

        @keyframes loading {
            0%, 80%, 100% {
                transform: scale(0);
                opacity: 0.5;
            }
            40% {
                transform: scale(1);
                opacity: 1;
            }
        }

        .status-badge {
            display: inline-block;
            background: #fed7d7;
            color: #c53030;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        /* 响应式设计 */
        @media (max-width: 480px) {
            .maintenance-container {
                padding: 40px 20px;
                margin: 20px;
            }

            .maintenance-title {
                font-size: 24px;
            }

            .maintenance-subtitle {
                font-size: 14px;
            }

            .contact-item {
                display: block;
                margin: 8px 0;
            }
        }

        /* 深色模式支持 */
        @media (prefers-color-scheme: dark) {
            body {
                background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
            }

            .maintenance-container {
                background: #2d3748;
                color: #e2e8f0;
            }

            .maintenance-title {
                color: #f7fafc;
            }

            .maintenance-subtitle {
                color: #a0aec0;
            }

            .maintenance-message {
                background: #4a5568;
                border-left-color: #667eea;
            }

            .maintenance-message h3 {
                color: #f7fafc;
            }

            .maintenance-message p {
                color: #cbd5e0;
            }

            .contact-info {
                border-top-color: #4a5568;
            }

            .contact-info h4 {
                color: #f7fafc;
            }
        }
    </style>
</head>
<body>
    <div class="maintenance-container">
        <div class="status-badge">系统离线</div>
        
        <div class="maintenance-icon"></div>
        
        <h1 class="maintenance-title">
            当前系统正在维护
            <div class="loading-dots">
                <span></span>
                <span></span>
                <span></span>
            </div>
        </h1>
        
        <p class="maintenance-subtitle">
            我们正在对系统进行升级和优化，以为您提供更好的服务体验
        </p>

        <div class="maintenance-message">
            <h3>维护信息</h3>
            <p><strong>维护时间：</strong>21:00 - 08:00</p>
            <p><strong>影响范围：</strong>所有在线服务暂时不可用</p>
        </div>
    </div>
</body>
</html>